tuple with only one element must end with a comma. Python won't know it's a
tuple without the comma. Probably not what you intended to do.
As far as the Python parser is concerned the parentheses are optional for non-empty tuples. According to the documentation: it is actually the comma which makes a tuple, not the parentheses. The parentheses are optional, except in the empty tuple case.
By missing the comma in
values = (1) expect to get a
TypeError when the code later attempts to perform tuple operations on a variable that evaluated to
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